Hydraulic back-pressure valve



A. KENNEn-Y.' HYDRAULIC BACK PRESSURE VALVE.

APPLICATION FILEDJUNE 20, l9l9.

Patented Feb. 1, 1921.

INVENTOR ANGUS KENNEDY.

pggz Y @b4/ww 0 ATTORNEYS.

PATENT OFFICE.

ANGUS IKIhl'hUlDY,` OF LONDON, ENG-DANIEL HYDRAULIC BACKPRESSURE VALVE.

in agian.

Application tiled June 20,

lle it known that I, riNeUs KENNEDY, subject oli the King of Great Britain and Ireland, residing at 23d-8 Pentonville road, `iioiulon, in the county oi London, England, have invented certain new and useful Im- In-oveineiits in llydraulic llaclr-Pressure i'ralves, oft which the following is afspecification.

lily invention relates to improvements in hydraulic back pressure valves particularly olf the ltype used in conjunction with oxyacet-ylene welding apparatus wherein a water seal is us l to prevent oxygen from the blowpipe from passing into the pipe leading lroru the acetylene oas holder or generator.

t known type oi safety val\.'e consists olf a closed cylindrical chamber having inlet and out-let cocks for the acetylene gas. The gas is led to the base of the chamber through a tube or pipe connected to the inlet cock and is discharged into the chamber beneath a water seal formed in the lower part of the apparatus. A second tube arranged above the lower open end of" the supply pipe and below the water levelpleads to a chamber or box open to the atmosphereand arranged outside said chamber.

The object ol the present invention is to provide a safety valve which will present a more elliective and reliable safeguardagainst explosion thanis obtained by the type at present in use.

According to the invention the device consists ci two cylindrical or other suitably shaped'chambers arranged, preferably, side by side. The top of the first chamber Vcarries the usual connections leadingto the gas holder or generator, and a downwardly extending supply pipe terminating at its lower end in a perforated chamber at or near the bottom of the valve chamber. At a convenient distance from the bottom this chamber communicates with a second chamber by means of a pipe or tube whose outer end benl'.- downwardly to a point a short distance trom the bottom of the second chamber. Within the second chamber is also arranged an escape pipe extending from a point a short distance from the bottom ot the chamber, but preferably level with or above the lower open end of the communicating pipe, through the top of the f ahamber to the atmosphere. Both chambers are provided with water level cocks by means of which the level of water in each chamber Specification of LettersPatent.`

lizltellttl Feb. 1, 1921. 1919. serial no. 305,714.

may be ascertained and regulated. The seeondlchamber is also provided with the usual cock by means of which the pipe leading to the blow-pipe or the like is con nected.

In order that the invention may be readily understood reference is directed to `the accompanying `drawings showing by way of example a valve constructed according to the invention in whic Figure l is a side elevation, and

Fig. 2 is a transverse vertical section of Fig. 1.

The apparatus is built up of two cylindrical. or other conveniently shaped chambers fr and arranged side by side. The chamber a, hereinafter referred to as the lirst chamber, is provided withl a port c connected to a pipe leading` to theacetylene generator or gas holder, by a nozzle or union joint (l. This port is nected to, a pipe or tube c extending to a point a short distance from the bottom of the chamber o its lower end `terminating in the usualperforated metalor gauzebox or casing f. 4At a suitable distance from the bottom of the chamber is a pipe g communica-ting with the second ychamber l), the outer end ofthe pipe-being bent downw wardly at g1, so as to terminate preferably a short distance from the bottom of the chamber l). Within the chamber l5 is also secured a vertical escape pipe f: extending from `a point,` either level with, or slightly above,` the lower f pipe g1, while its upper end, which extends outside said chamber, may` have an open inverted cone or funnelshaped vessel Z. Both chambers@ and b are provided `with water level regulating cocks m, by means ot which the level of water in each of the chambers may be ascertained and regulated.

The second chamber o is also provided with the usual controlling cock n and nozzle nl to which the supply pipe leading to the blowpipe or the like is connected.

The pipe g connectingr the two chambers may be secured thereto in any suitable man ner.

The operation oit the appa atus is as iollows y y During' normal working, the acetylene gas passes through the port c into the first chainber oV and thence into the second chamber b through the connecting pipe g, g1, after which the gas passes through the nozzle al formed with, or conopen end of the connecting to the delivery pipe connected to the blowvupper end lof the connecting pipe g1 is below the waterlevel. Meanwhile the level of Watenin the .chamber b will fall below the lower open end of theescape pipe 7c and permit' the oxygen Jforced back into said chamber, to passaway to the atmosphere while the' .passage of acetylene gasthrough the pipe gbr/1, into the chamber Zi, is prevented by the waterjseal formed therein.

Y By this means the water in the two chamberswillfforma double safety valve whereby it is impossible for an explosion to occur through a mixture of oxygen and acetylene gas remaining in the apparatus.

y lilhat l yclaim as my invention and desire to obtain by Letters Patent is l. A back pressure .release valve comprisingtwo separate chambers, an inlet pipe for gas leading into one chamber at, its upper part and extending to a point near its base, Said pipe having an opening within said Chamber at itslower end, a transfer pipe leading Vfrom said chamber at a level disposedabovethe lower end of said inlet pipe, andl leading int'oasecond chamber wherein itsjend passes downwardly, to a pointnear the base of'said chamber, an opening at the lower end of said pipe, a gas escape pipe yhavin its lower end disposed within. the

secon.' chamber' at a pointonear its base, an

opening in said lower end, said pipe passing upwardly through said chamber and having its upper end open and disposed exterior to said chamber, and an outlet passage leading from said second chamber at a level above the lower end of said escape passage.

. 2. back pressure release valve comprising twoseparate chambers, an inlet passage for gas leading into one chamber and extending to a point near its base, said passage having an opening within said chamber at. its lower end, a transfer passage leading from said chamber at a level disposed above. the lower end o't said inlet passage, and leading into the second chamber wherein its end passes downwardly to a point near the base of said chamber, an opening at the lower end of said passage, a gas escape passage having its lower end disposed within the second chamber at a peint near its base. an Opening in said lower end. said passage passing up 'ardly and having its upper end open and disposed exterior to said chamber. an outlet passage leading 'l'rom said serond chamber at a level above the lower rnd ol' said escape passage, and valve controlled openings in each of said chambers at a level disposed below the upper end ol the trans- 'fer passage and above. the lower end ol' the transfer passage.

3. back pressure release valve comprising two separate chambers. an inlet passage for gas leading into one chamber and extending to a point near its base. said passage having an opening within said chamber at its lower end. a transl'er passage leading from said chamber at a level disposed abo\ e the lower end of said inlet passage. and leading into the second chamber wherein its end passes downwardly to a. point near the base of said chamber, an opening at the lower end of said passage, a gas escape passage having its lower end disposed within the second chamber at a point nar its base. an opening in said lower end, said passage passing npwardly and having its upper end open and disposed exterior to said chamber. an outlet passage leading Jfrom said second chamber at a level above the lower end of said est-ape passage, and valve controlled openings in each of said chambers at'y a level disposed below the upper end oli the transfer passage and above the lower end ot the transfer passage, liquid in the base oi" each t-hamber below the upper end olt said transfer passage.

AN'IlUS KENED Y. 

